Equivalent ideal diode circuit analysis

Question

I have been looking over multiple designs for ideal diodes using FET transistors such as the circuits from these posts:

PMOSFET Ideal Diode for 24V

Understanding an 'ideal' diode made from a p-channel MOSFET and PNP transistors

and from this site:

http://jiggerjuice.info/electronics/projects/power/ideal-diode.html

The part that I don't understand is why they use so many other components in their designs. My question is if the following circuit I designed functions the same as the ones linked above.

^{simulate this circuit – Schematic created using CircuitLab}

The zener diode is being used to protect the gate terminal on the FET.

edit: for use as a high side half wave rectifier:

Answer 1

The whole point of an ideal diode is to detect and turn on when the output voltage is less than the input voltage.

All your circuit does is turn on the MOSFET when the voltage on the right is high enough.

In other words... your circuit is not even a non-ideal diode.

^{simulate this circuit – Schematic created using CircuitLab}

The "other" components you mention form a comparator around the MOSFET and only turn it on if the left side voltage > right side voltage.

Your circuit could I guess be used for reverse polarity protection though assuming the voltage on the right has no, or a very short, residual after being unplugged on the left.